blob: e37a5b0844bfd4ae4cbcd228c0c9c95e930fd323 [file] [log] [blame]
/*
* Copyright 2019 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "src/gpu/Swizzle.h"
#include "src/core/SkRasterPipeline.h"
#include "src/core/SkRasterPipelineOpList.h"
#include <cstring>
namespace skgpu {
void Swizzle::apply(SkRasterPipeline* pipeline) const {
SkASSERT(pipeline);
switch (fKey) {
case Swizzle("rgba").asKey():
return;
case Swizzle("bgra").asKey():
pipeline->append(SkRasterPipelineOp::swap_rb);
return;
case Swizzle("aaa1").asKey():
pipeline->append(SkRasterPipelineOp::alpha_to_gray);
return;
case Swizzle("rgb1").asKey():
pipeline->append(SkRasterPipelineOp::force_opaque);
return;
case Swizzle("a001").asKey():
pipeline->append(SkRasterPipelineOp::alpha_to_red);
return;
default: {
static_assert(sizeof(uintptr_t) >= 4 * sizeof(char));
// Rather than allocate the 4 control bytes on the heap somewhere, just jam them right
// into a uintptr_t context.
uintptr_t ctx = {};
memcpy(&ctx, this->asString().c_str(), 4 * sizeof(char));
pipeline->append(SkRasterPipelineOp::swizzle, ctx);
return;
}
}
}
SkString Swizzle::asString() const {
char swiz[5];
uint16_t key = fKey;
for (int i = 0; i < 4; ++i) {
swiz[i] = IToC(key & 0xfU);
key >>= 4;
}
swiz[4] = '\0';
return SkString(swiz);
}
} // namespace skgpu